As the broadband internet is popularized and the output value of digital content continues increasing, the market of online transaction is expected to grow dramatically in the future. How to assure rights and interests of participants don’t be damaged when they make online transaction? The dependable online payment scheme is the critical factor. Meanwhile, under the knowledge-intensive era, a digital content can be created by several individuals who have interrelated knowledge. The selling revenue of the digital content should be correctly assigned to each payee (authors and merchants) in real time, so that creators may have stronger motivation to create more digital content. Base on the above-mentioned, the purpose of this paper is to design an online payment scheme which has three features, include (1) assuring the payment security and transaction privacy, (2) preventing frauds from being made, and (3) supporting multiple payees payment.In this paper, we combine the concepts of randomized RSA partially blind signature, DR-signature (a kind of convertible signature), and multi-signature, to propose a four phase online payment scheme, include (1) initializing phase, (2) withdrawing phase, (3) purchasing phase, and (4) requesting phase. In the initializing phase, all members (customers, merchants, and authors) register to the third trust party (TTP), bank needs to generate RSA-based private/public keys, and all payees belong to one digital content should make a multi-signature of a proportion of apportionment (PROPp_id). Customers, merchants, bank, and TTP complete an online transaction in withdrawing phase and purchasing phase. If someone finds his rights is damaged, he can request TTP to arbitrate to safeguard himself in the requesting phase. Base on cryptographic skill and design of transaction process, our proposed payment scheme can assure payment security and transaction privacy, prevent frauds, and support multilateral payment.